To express that an action is difficult to do (by the person performing the action), the auxiliary adjective がたい may be appended to the verb stem.
Properties of がたい as an auxiliary adjective include:
- Used with less physical, more emotional verbs than にくい.
- Can be more extreme than にくい.
- Describing actions as easy or hard – Tae Kim’s Japanese grammar guide (guidetojapanese.org)